summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/nand/plat_nand.c
blob: c004566a9ad2ae383a311ea31587411e0a98aaa7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
/*
 * Generic NAND driver
 *
 * Author: Vitaly Wool <vitalywool@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>

struct plat_nand_data {
	struct nand_chip	chip;
	struct mtd_info		mtd;
	void __iomem		*io_base;
};

static const char *part_probe_types[] = { "cmdlinepart", NULL };

/*
 * Probe for the NAND device.
 */
static int plat_nand_probe(struct platform_device *pdev)
{
	struct platform_nand_data *pdata = pdev->dev.platform_data;
	struct mtd_part_parser_data ppdata;
	struct plat_nand_data *data;
	struct resource *res;
	const char **part_types;
	int err = 0;

	if (!pdata) {
		dev_err(&pdev->dev, "platform_nand_data is missing\n");
		return -EINVAL;
	}

	if (pdata->chip.nr_chips < 1) {
		dev_err(&pdev->dev, "invalid number of chips specified\n");
		return -EINVAL;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENXIO;

	/* Allocate memory for the device structure (and zero it) */
	data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
	if (!data) {
		dev_err(&pdev->dev, "failed to allocate device structure.\n");
		return -ENOMEM;
	}

	if (!request_mem_region(res->start, resource_size(res),
				dev_name(&pdev->dev))) {
		dev_err(&pdev->dev, "request_mem_region failed\n");
		err = -EBUSY;
		goto out_free;
	}

	data->io_base = ioremap(res->start, resource_size(res));
	if (data->io_base == NULL) {
		dev_err(&pdev->dev, "ioremap failed\n");
		err = -EIO;
		goto out_release_io;
	}

	data->chip.priv = &data;
	data->mtd.priv = &data->chip;
	data->mtd.owner = THIS_MODULE;
	data->mtd.name = dev_name(&pdev->dev);

	data->chip.IO_ADDR_R = data->io_base;
	data->chip.IO_ADDR_W = data->io_base;
	data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
	data->chip.dev_ready = pdata->ctrl.dev_ready;
	data->chip.select_chip = pdata->ctrl.select_chip;
	data->chip.write_buf = pdata->ctrl.write_buf;
	data->chip.read_buf = pdata->ctrl.read_buf;
	data->chip.read_byte = pdata->ctrl.read_byte;
	data->chip.chip_delay = pdata->chip.chip_delay;
	data->chip.options |= pdata->chip.options;
	data->chip.bbt_options |= pdata->chip.bbt_options;

	data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
	data->chip.ecc.layout = pdata->chip.ecclayout;
	data->chip.ecc.mode = NAND_ECC_SOFT;

	platform_set_drvdata(pdev, data);

	/* Handle any platform specific setup */
	if (pdata->ctrl.probe) {
		err = pdata->ctrl.probe(pdev);
		if (err)
			goto out;
	}

	/* Scan to find existence of the device */
	if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
		err = -ENXIO;
		goto out;
	}

	part_types = pdata->chip.part_probe_types ? : part_probe_types;

	ppdata.of_node = pdev->dev.of_node;
	err = mtd_device_parse_register(&data->mtd, part_types, &ppdata,
					pdata->chip.partitions,
					pdata->chip.nr_partitions);

	if (!err)
		return err;

	nand_release(&data->mtd);
out:
	if (pdata->ctrl.remove)
		pdata->ctrl.remove(pdev);
	platform_set_drvdata(pdev, NULL);
	iounmap(data->io_base);
out_release_io:
	release_mem_region(res->start, resource_size(res));
out_free:
	kfree(data);
	return err;
}

/*
 * Remove a NAND device.
 */
static int plat_nand_remove(struct platform_device *pdev)
{
	struct plat_nand_data *data = platform_get_drvdata(pdev);
	struct platform_nand_data *pdata = pdev->dev.platform_data;
	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	nand_release(&data->mtd);
	if (pdata->ctrl.remove)
		pdata->ctrl.remove(pdev);
	iounmap(data->io_base);
	release_mem_region(res->start, resource_size(res));
	kfree(data);

	return 0;
}

static const struct of_device_id plat_nand_match[] = {
	{ .compatible = "gen_nand" },
	{},
};
MODULE_DEVICE_TABLE(of, plat_nand_match);

static struct platform_driver plat_nand_driver = {
	.probe	= plat_nand_probe,
	.remove	= plat_nand_remove,
	.driver	= {
		.name		= "gen_nand",
		.owner		= THIS_MODULE,
		.of_match_table = plat_nand_match,
	},
};

module_platform_driver(plat_nand_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vitaly Wool");
MODULE_DESCRIPTION("Simple generic NAND driver");
MODULE_ALIAS("platform:gen_nand");